Downtimed is a daemon intended to monitor and record the times
an operating system is non-functional. It does this by keeping
a simple databas file and by regularly recording time stamps.
A client executable reads the database to account for the lengths
of periods when the system was down.

/usr/share/doc/downtimed/README.gz

downtimed - system downtime monitoring and reporting tool
=========================================================
Copyright (c) 2009-2011 EPIPE Communications. All rights reserved.
This software is licensed under the terms and conditions of the FreeBSD
License which is also known as the Simplified BSD License. You should have
received a copy of that license along with this software.
Software
more»